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What Is Osmosis And Diffusion?

What is osmosis and how does it differ from diffusion?

  • I have a biology mock gcse on monday, and one of the topics we're covering is osmosis. I know the textbook defiinition, but I don't understand what osmosis actually is and how it differs from diffusion? If anyone could help, that't be great. Thanks! x

  • Answer:

    Osmosis IS diffusion, bit with a differentially permeable barrier that stops larger molecules. Thus water molecules on the side of the barrier with little solute will diffuse at a greater rate than those on the other side, because they are a t a higher concentration. The result is a net movement of water from the side with a low concentration of solute into the side with the high concentration of solute.

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Osmosis is diffusion through a semipermeable membrane against a concentration gradient.

visnarayan

Diffusion is the passive movement of particles from an area of high concentration to an area of low concentration. You need to learn this! :) It means that is there's a small amount of something on one side and a high amount of something on the other side, the side with the most particles will spread out onto the other side. Osmosis is basically the same thing but it's only for WATER and it's across a SEMI-PERMEABLE MEMBRANE. A semi-permeable (or partially permeable) membrane is a surface that only small particles can fit through. It's often drawn as a dotted line. It's often used in plant cells to allow water into the vacuole.

Soya

OMD, i have a biology mock on Monday too! Osmosis is the movement of WATER through a semi permeable membrane Diffussion is the movement of any molecule through a semi permeable membrane

ZedQue

in osmosis Solvent particles move to solute area not vice-versa in diffusion Solvent particles move to solute area and vice-versa it may help http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/diffus.html

ARPIT

Osmosis is movement of water molecules from higher to lower concentration.whereas diffusion is movement of solute from higher to lower concentration

Pramod

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